Merging upstream version 4.19.289.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 1929 deletions

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
deleted file mode 100644
index 658191fba..000000000
--- a/net/decnet/dn_route.c
+++ /dev/null
@@ -1,1929 +0,0 @@
-/*
- * DECnet       An implementation of the DECnet protocol suite for the LINUX
- *              operating system.  DECnet is implemented using the  BSD Socket
- *              interface as the means of communication with the user level.
- *
- *              DECnet Routing Functions (Endnode and Router)
- *
- * Authors:     Steve Whitehouse <SteveW@ACM.org>
- *              Eduardo Marcelo Serrat <emserrat@geocities.com>
- *
- * Changes:
- *              Steve Whitehouse : Fixes to allow "intra-ethernet" and
- *                                 "return-to-sender" bits on outgoing
- *                                 packets.
- *		Steve Whitehouse : Timeouts for cached routes.
- *              Steve Whitehouse : Use dst cache for input routes too.
- *              Steve Whitehouse : Fixed error values in dn_send_skb.
- *              Steve Whitehouse : Rework routing functions to better fit
- *                                 DECnet routing design
- *              Alexey Kuznetsov : New SMP locking
- *              Steve Whitehouse : More SMP locking changes & dn_cache_dump()
- *              Steve Whitehouse : Prerouting NF hook, now really is prerouting.
- *				   Fixed possible skb leak in rtnetlink funcs.
- *              Steve Whitehouse : Dave Miller's dynamic hash table sizing and
- *                                 Alexey Kuznetsov's finer grained locking
- *                                 from ipv4/route.c.
- *              Steve Whitehouse : Routing is now starting to look like a
- *                                 sensible set of code now, mainly due to
- *                                 my copying the IPv4 routing code. The
- *                                 hooks here are modified and will continue
- *                                 to evolve for a while.
- *              Steve Whitehouse : Real SMP at last :-) Also new netfilter
- *                                 stuff. Look out raw sockets your days
- *                                 are numbered!
- *              Steve Whitehouse : Added return-to-sender functions. Added
- *                                 backlog congestion level return codes.
- *		Steve Whitehouse : Fixed bug where routes were set up with
- *                                 no ref count on net devices.
- *              Steve Whitehouse : RCU for the route cache
- *              Steve Whitehouse : Preparations for the flow cache
- *              Steve Whitehouse : Prepare for nonlinear skbs
- */
-
-/******************************************************************************
-    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-*******************************************************************************/
-
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/socket.h>
-#include <linux/in.h>
-#include <linux/kernel.h>
-#include <linux/sockios.h>
-#include <linux/net.h>
-#include <linux/netdevice.h>
-#include <linux/inet.h>
-#include <linux/route.h>
-#include <linux/in_route.h>
-#include <linux/slab.h>
-#include <net/sock.h>
-#include <linux/mm.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/init.h>
-#include <linux/rtnetlink.h>
-#include <linux/string.h>
-#include <linux/netfilter_decnet.h>
-#include <linux/rcupdate.h>
-#include <linux/times.h>
-#include <linux/export.h>
-#include <asm/errno.h>
-#include <net/net_namespace.h>
-#include <net/netlink.h>
-#include <net/neighbour.h>
-#include <net/dst.h>
-#include <net/flow.h>
-#include <net/fib_rules.h>
-#include <net/dn.h>
-#include <net/dn_dev.h>
-#include <net/dn_nsp.h>
-#include <net/dn_route.h>
-#include <net/dn_neigh.h>
-#include <net/dn_fib.h>
-
-struct dn_rt_hash_bucket
-{
-	struct dn_route __rcu *chain;
-	spinlock_t lock;
-};
-
-extern struct neigh_table dn_neigh_table;
-
-
-static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
-
-static const int dn_rt_min_delay = 2 * HZ;
-static const int dn_rt_max_delay = 10 * HZ;
-static const int dn_rt_mtu_expires = 10 * 60 * HZ;
-
-static unsigned long dn_rt_deadline;
-
-static int dn_dst_gc(struct dst_ops *ops);
-static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
-static unsigned int dn_dst_default_advmss(const struct dst_entry *dst);
-static unsigned int dn_dst_mtu(const struct dst_entry *dst);
-static void dn_dst_destroy(struct dst_entry *);
-static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how);
-static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
-static void dn_dst_link_failure(struct sk_buff *);
-static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
-			       struct sk_buff *skb , u32 mtu,
-			       bool confirm_neigh);
-static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
-			    struct sk_buff *skb);
-static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
-					     struct sk_buff *skb,
-					     const void *daddr);
-static int dn_route_input(struct sk_buff *);
-static void dn_run_flush(struct timer_list *unused);
-
-static struct dn_rt_hash_bucket *dn_rt_hash_table;
-static unsigned int dn_rt_hash_mask;
-
-static struct timer_list dn_route_timer;
-static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush);
-int decnet_dst_gc_interval = 2;
-
-static struct dst_ops dn_dst_ops = {
-	.family =		PF_DECnet,
-	.gc_thresh =		128,
-	.gc =			dn_dst_gc,
-	.check =		dn_dst_check,
-	.default_advmss =	dn_dst_default_advmss,
-	.mtu =			dn_dst_mtu,
-	.cow_metrics =		dst_cow_metrics_generic,
-	.destroy =		dn_dst_destroy,
-	.ifdown =		dn_dst_ifdown,
-	.negative_advice =	dn_dst_negative_advice,
-	.link_failure =		dn_dst_link_failure,
-	.update_pmtu =		dn_dst_update_pmtu,
-	.redirect =		dn_dst_redirect,
-	.neigh_lookup =		dn_dst_neigh_lookup,
-};
-
-static void dn_dst_destroy(struct dst_entry *dst)
-{
-	struct dn_route *rt = (struct dn_route *) dst;
-
-	if (rt->n)
-		neigh_release(rt->n);
-	dst_destroy_metrics_generic(dst);
-}
-
-static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how)
-{
-	if (how) {
-		struct dn_route *rt = (struct dn_route *) dst;
-		struct neighbour *n = rt->n;
-
-		if (n && n->dev == dev) {
-			n->dev = dev_net(dev)->loopback_dev;
-			dev_hold(n->dev);
-			dev_put(dev);
-		}
-	}
-}
-
-static __inline__ unsigned int dn_hash(__le16 src, __le16 dst)
-{
-	__u16 tmp = (__u16 __force)(src ^ dst);
-	tmp ^= (tmp >> 3);
-	tmp ^= (tmp >> 5);
-	tmp ^= (tmp >> 10);
-	return dn_rt_hash_mask & (unsigned int)tmp;
-}
-
-static void dn_dst_check_expire(struct timer_list *unused)
-{
-	int i;
-	struct dn_route *rt;
-	struct dn_route __rcu **rtp;
-	unsigned long now = jiffies;
-	unsigned long expire = 120 * HZ;
-
-	for (i = 0; i <= dn_rt_hash_mask; i++) {
-		rtp = &dn_rt_hash_table[i].chain;
-
-		spin_lock(&dn_rt_hash_table[i].lock);
-		while ((rt = rcu_dereference_protected(*rtp,
-						lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
-			if (atomic_read(&rt->dst.__refcnt) > 1 ||
-			    (now - rt->dst.lastuse) < expire) {
-				rtp = &rt->dn_next;
-				continue;
-			}
-			*rtp = rt->dn_next;
-			rt->dn_next = NULL;
-			dst_dev_put(&rt->dst);
-			dst_release(&rt->dst);
-		}
-		spin_unlock(&dn_rt_hash_table[i].lock);
-
-		if ((jiffies - now) > 0)
-			break;
-	}
-
-	mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
-}
-
-static int dn_dst_gc(struct dst_ops *ops)
-{
-	struct dn_route *rt;
-	struct dn_route __rcu **rtp;
-	int i;
-	unsigned long now = jiffies;
-	unsigned long expire = 10 * HZ;
-
-	for (i = 0; i <= dn_rt_hash_mask; i++) {
-
-		spin_lock_bh(&dn_rt_hash_table[i].lock);
-		rtp = &dn_rt_hash_table[i].chain;
-
-		while ((rt = rcu_dereference_protected(*rtp,
-						lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
-			if (atomic_read(&rt->dst.__refcnt) > 1 ||
-			    (now - rt->dst.lastuse) < expire) {
-				rtp = &rt->dn_next;
-				continue;
-			}
-			*rtp = rt->dn_next;
-			rt->dn_next = NULL;
-			dst_dev_put(&rt->dst);
-			dst_release(&rt->dst);
-			break;
-		}
-		spin_unlock_bh(&dn_rt_hash_table[i].lock);
-	}
-
-	return 0;
-}
-
-/*
- * The decnet standards don't impose a particular minimum mtu, what they
- * do insist on is that the routing layer accepts a datagram of at least
- * 230 bytes long. Here we have to subtract the routing header length from
- * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
- * assume the worst and use a long header size.
- *
- * We update both the mtu and the advertised mss (i.e. the segment size we
- * advertise to the other end).
- */
-static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
-			       struct sk_buff *skb, u32 mtu,
-			       bool confirm_neigh)
-{
-	struct dn_route *rt = (struct dn_route *) dst;
-	struct neighbour *n = rt->n;
-	u32 min_mtu = 230;
-	struct dn_dev *dn;
-
-	dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL;
-
-	if (dn && dn->use_long == 0)
-		min_mtu -= 6;
-	else
-		min_mtu -= 21;
-
-	if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
-		if (!(dst_metric_locked(dst, RTAX_MTU))) {
-			dst_metric_set(dst, RTAX_MTU, mtu);
-			dst_set_expires(dst, dn_rt_mtu_expires);
-		}
-		if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
-			u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
-			u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS);
-			if (!existing_mss || existing_mss > mss)
-				dst_metric_set(dst, RTAX_ADVMSS, mss);
-		}
-	}
-}
-
-static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
-			    struct sk_buff *skb)
-{
-}
-
-/*
- * When a route has been marked obsolete. (e.g. routing cache flush)
- */
-static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
-{
-	return NULL;
-}
-
-static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
-{
-	dst_release(dst);
-	return NULL;
-}
-
-static void dn_dst_link_failure(struct sk_buff *skb)
-{
-}
-
-static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2)
-{
-	return ((fl1->daddr ^ fl2->daddr) |
-		(fl1->saddr ^ fl2->saddr) |
-		(fl1->flowidn_mark ^ fl2->flowidn_mark) |
-		(fl1->flowidn_scope ^ fl2->flowidn_scope) |
-		(fl1->flowidn_oif ^ fl2->flowidn_oif) |
-		(fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0;
-}
-
-static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp)
-{
-	struct dn_route *rth;
-	struct dn_route __rcu **rthp;
-	unsigned long now = jiffies;
-
-	rthp = &dn_rt_hash_table[hash].chain;
-
-	spin_lock_bh(&dn_rt_hash_table[hash].lock);
-	while ((rth = rcu_dereference_protected(*rthp,
-						lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
-		if (compare_keys(&rth->fld, &rt->fld)) {
-			/* Put it first */
-			*rthp = rth->dn_next;
-			rcu_assign_pointer(rth->dn_next,
-					   dn_rt_hash_table[hash].chain);
-			rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
-
-			dst_hold_and_use(&rth->dst, now);
-			spin_unlock_bh(&dn_rt_hash_table[hash].lock);
-
-			dst_release_immediate(&rt->dst);
-			*rp = rth;
-			return 0;
-		}
-		rthp = &rth->dn_next;
-	}
-
-	rcu_assign_pointer(rt->dn_next, dn_rt_hash_table[hash].chain);
-	rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
-
-	dst_hold_and_use(&rt->dst, now);
-	spin_unlock_bh(&dn_rt_hash_table[hash].lock);
-	*rp = rt;
-	return 0;
-}
-
-static void dn_run_flush(struct timer_list *unused)
-{
-	int i;
-	struct dn_route *rt, *next;
-
-	for (i = 0; i < dn_rt_hash_mask; i++) {
-		spin_lock_bh(&dn_rt_hash_table[i].lock);
-
-		if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
-			goto nothing_to_declare;
-
-		for(; rt; rt = next) {
-			next = rcu_dereference_raw(rt->dn_next);
-			RCU_INIT_POINTER(rt->dn_next, NULL);
-			dst_dev_put(&rt->dst);
-			dst_release(&rt->dst);
-		}
-
-nothing_to_declare:
-		spin_unlock_bh(&dn_rt_hash_table[i].lock);
-	}
-}
-
-static DEFINE_SPINLOCK(dn_rt_flush_lock);
-
-void dn_rt_cache_flush(int delay)
-{
-	unsigned long now = jiffies;
-	int user_mode = !in_interrupt();
-
-	if (delay < 0)
-		delay = dn_rt_min_delay;
-
-	spin_lock_bh(&dn_rt_flush_lock);
-
-	if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
-		long tmo = (long)(dn_rt_deadline - now);
-
-		if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
-			tmo = 0;
-
-		if (delay > tmo)
-			delay = tmo;
-	}
-
-	if (delay <= 0) {
-		spin_unlock_bh(&dn_rt_flush_lock);
-		dn_run_flush(NULL);
-		return;
-	}
-
-	if (dn_rt_deadline == 0)
-		dn_rt_deadline = now + dn_rt_max_delay;
-
-	dn_rt_flush_timer.expires = now + delay;
-	add_timer(&dn_rt_flush_timer);
-	spin_unlock_bh(&dn_rt_flush_lock);
-}
-
-/**
- * dn_return_short - Return a short packet to its sender
- * @skb: The packet to return
- *
- */
-static int dn_return_short(struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb;
-	unsigned char *ptr;
-	__le16 *src;
-	__le16 *dst;
-
-	/* Add back headers */
-	skb_push(skb, skb->data - skb_network_header(skb));
-
-	if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
-		return NET_RX_DROP;
-
-	cb = DN_SKB_CB(skb);
-	/* Skip packet length and point to flags */
-	ptr = skb->data + 2;
-	*ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
-
-	dst = (__le16 *)ptr;
-	ptr += 2;
-	src = (__le16 *)ptr;
-	ptr += 2;
-	*ptr = 0; /* Zero hop count */
-
-	swap(*src, *dst);
-
-	skb->pkt_type = PACKET_OUTGOING;
-	dn_rt_finish_output(skb, NULL, NULL);
-	return NET_RX_SUCCESS;
-}
-
-/**
- * dn_return_long - Return a long packet to its sender
- * @skb: The long format packet to return
- *
- */
-static int dn_return_long(struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb;
-	unsigned char *ptr;
-	unsigned char *src_addr, *dst_addr;
-	unsigned char tmp[ETH_ALEN];
-
-	/* Add back all headers */
-	skb_push(skb, skb->data - skb_network_header(skb));
-
-	if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
-		return NET_RX_DROP;
-
-	cb = DN_SKB_CB(skb);
-	/* Ignore packet length and point to flags */
-	ptr = skb->data + 2;
-
-	/* Skip padding */
-	if (*ptr & DN_RT_F_PF) {
-		char padlen = (*ptr & ~DN_RT_F_PF);
-		ptr += padlen;
-	}
-
-	*ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
-	ptr += 2;
-	dst_addr = ptr;
-	ptr += 8;
-	src_addr = ptr;
-	ptr += 6;
-	*ptr = 0; /* Zero hop count */
-
-	/* Swap source and destination */
-	memcpy(tmp, src_addr, ETH_ALEN);
-	memcpy(src_addr, dst_addr, ETH_ALEN);
-	memcpy(dst_addr, tmp, ETH_ALEN);
-
-	skb->pkt_type = PACKET_OUTGOING;
-	dn_rt_finish_output(skb, dst_addr, src_addr);
-	return NET_RX_SUCCESS;
-}
-
-/**
- * dn_route_rx_packet - Try and find a route for an incoming packet
- * @skb: The packet to find a route for
- *
- * Returns: result of input function if route is found, error code otherwise
- */
-static int dn_route_rx_packet(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb;
-	int err;
-
-	if ((err = dn_route_input(skb)) == 0)
-		return dst_input(skb);
-
-	cb = DN_SKB_CB(skb);
-	if (decnet_debug_level & 4) {
-		char *devname = skb->dev ? skb->dev->name : "???";
-
-		printk(KERN_DEBUG
-			"DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
-			(int)cb->rt_flags, devname, skb->len,
-			le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
-			err, skb->pkt_type);
-	}
-
-	if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
-		switch (cb->rt_flags & DN_RT_PKT_MSK) {
-		case DN_RT_PKT_SHORT:
-			return dn_return_short(skb);
-		case DN_RT_PKT_LONG:
-			return dn_return_long(skb);
-		}
-	}
-
-	kfree_skb(skb);
-	return NET_RX_DROP;
-}
-
-static int dn_route_rx_long(struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-	unsigned char *ptr = skb->data;
-
-	if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
-		goto drop_it;
-
-	skb_pull(skb, 20);
-	skb_reset_transport_header(skb);
-
-	/* Destination info */
-	ptr += 2;
-	cb->dst = dn_eth2dn(ptr);
-	if (memcmp(ptr, dn_hiord_addr, 4) != 0)
-		goto drop_it;
-	ptr += 6;
-
-
-	/* Source info */
-	ptr += 2;
-	cb->src = dn_eth2dn(ptr);
-	if (memcmp(ptr, dn_hiord_addr, 4) != 0)
-		goto drop_it;
-	ptr += 6;
-	/* Other junk */
-	ptr++;
-	cb->hops = *ptr++; /* Visit Count */
-
-	return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING,
-		       &init_net, NULL, skb, skb->dev, NULL,
-		       dn_route_rx_packet);
-
-drop_it:
-	kfree_skb(skb);
-	return NET_RX_DROP;
-}
-
-
-
-static int dn_route_rx_short(struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-	unsigned char *ptr = skb->data;
-
-	if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
-		goto drop_it;
-
-	skb_pull(skb, 5);
-	skb_reset_transport_header(skb);
-
-	cb->dst = *(__le16 *)ptr;
-	ptr += 2;
-	cb->src = *(__le16 *)ptr;
-	ptr += 2;
-	cb->hops = *ptr & 0x3f;
-
-	return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING,
-		       &init_net, NULL, skb, skb->dev, NULL,
-		       dn_route_rx_packet);
-
-drop_it:
-	kfree_skb(skb);
-	return NET_RX_DROP;
-}
-
-static int dn_route_discard(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
-	/*
-	 * I know we drop the packet here, but thats considered success in
-	 * this case
-	 */
-	kfree_skb(skb);
-	return NET_RX_SUCCESS;
-}
-
-static int dn_route_ptp_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
-	dn_dev_hello(skb);
-	dn_neigh_pointopoint_hello(skb);
-	return NET_RX_SUCCESS;
-}
-
-int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
-{
-	struct dn_skb_cb *cb;
-	unsigned char flags = 0;
-	__u16 len = le16_to_cpu(*(__le16 *)skb->data);
-	struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
-	unsigned char padlen = 0;
-
-	if (!net_eq(dev_net(dev), &init_net))
-		goto dump_it;
-
-	if (dn == NULL)
-		goto dump_it;
-
-	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
-		goto out;
-
-	if (!pskb_may_pull(skb, 3))
-		goto dump_it;
-
-	skb_pull(skb, 2);
-
-	if (len > skb->len)
-		goto dump_it;
-
-	skb_trim(skb, len);
-
-	flags = *skb->data;
-
-	cb = DN_SKB_CB(skb);
-	cb->stamp = jiffies;
-	cb->iif = dev->ifindex;
-
-	/*
-	 * If we have padding, remove it.
-	 */
-	if (flags & DN_RT_F_PF) {
-		padlen = flags & ~DN_RT_F_PF;
-		if (!pskb_may_pull(skb, padlen + 1))
-			goto dump_it;
-		skb_pull(skb, padlen);
-		flags = *skb->data;
-	}
-
-	skb_reset_network_header(skb);
-
-	/*
-	 * Weed out future version DECnet
-	 */
-	if (flags & DN_RT_F_VER)
-		goto dump_it;
-
-	cb->rt_flags = flags;
-
-	if (decnet_debug_level & 1)
-		printk(KERN_DEBUG
-			"dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
-			(int)flags, (dev) ? dev->name : "???", len, skb->len,
-			padlen);
-
-	if (flags & DN_RT_PKT_CNTL) {
-		if (unlikely(skb_linearize(skb)))
-			goto dump_it;
-
-		switch (flags & DN_RT_CNTL_MSK) {
-		case DN_RT_PKT_INIT:
-			dn_dev_init_pkt(skb);
-			break;
-		case DN_RT_PKT_VERI:
-			dn_dev_veri_pkt(skb);
-			break;
-		}
-
-		if (dn->parms.state != DN_DEV_S_RU)
-			goto dump_it;
-
-		switch (flags & DN_RT_CNTL_MSK) {
-		case DN_RT_PKT_HELO:
-			return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
-				       &init_net, NULL, skb, skb->dev, NULL,
-				       dn_route_ptp_hello);
-
-		case DN_RT_PKT_L1RT:
-		case DN_RT_PKT_L2RT:
-			return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE,
-				       &init_net, NULL, skb, skb->dev, NULL,
-				       dn_route_discard);
-		case DN_RT_PKT_ERTH:
-			return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
-				       &init_net, NULL, skb, skb->dev, NULL,
-				       dn_neigh_router_hello);
-
-		case DN_RT_PKT_EEDH:
-			return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
-				       &init_net, NULL, skb, skb->dev, NULL,
-				       dn_neigh_endnode_hello);
-		}
-	} else {
-		if (dn->parms.state != DN_DEV_S_RU)
-			goto dump_it;
-
-		skb_pull(skb, 1); /* Pull flags */
-
-		switch (flags & DN_RT_PKT_MSK) {
-		case DN_RT_PKT_LONG:
-			return dn_route_rx_long(skb);
-		case DN_RT_PKT_SHORT:
-			return dn_route_rx_short(skb);
-		}
-	}
-
-dump_it:
-	kfree_skb(skb);
-out:
-	return NET_RX_DROP;
-}
-
-static int dn_output(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
-	struct dst_entry *dst = skb_dst(skb);
-	struct dn_route *rt = (struct dn_route *)dst;
-	struct net_device *dev = dst->dev;
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
-	int err = -EINVAL;
-
-	if (rt->n == NULL)
-		goto error;
-
-	skb->dev = dev;
-
-	cb->src = rt->rt_saddr;
-	cb->dst = rt->rt_daddr;
-
-	/*
-	 * Always set the Intra-Ethernet bit on all outgoing packets
-	 * originated on this node. Only valid flag from upper layers
-	 * is return-to-sender-requested. Set hop count to 0 too.
-	 */
-	cb->rt_flags &= ~DN_RT_F_RQR;
-	cb->rt_flags |= DN_RT_F_IE;
-	cb->hops = 0;
-
-	return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT,
-		       &init_net, sk, skb, NULL, dev,
-		       dn_to_neigh_output);
-
-error:
-	net_dbg_ratelimited("dn_output: This should not happen\n");
-
-	kfree_skb(skb);
-
-	return err;
-}
-
-static int dn_forward(struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-	struct dst_entry *dst = skb_dst(skb);
-	struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
-	struct dn_route *rt;
-	int header_len;
-	struct net_device *dev = skb->dev;
-
-	if (skb->pkt_type != PACKET_HOST)
-		goto drop;
-
-	/* Ensure that we have enough space for headers */
-	rt = (struct dn_route *)skb_dst(skb);
-	header_len = dn_db->use_long ? 21 : 6;
-	if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len))
-		goto drop;
-
-	/*
-	 * Hop count exceeded.
-	 */
-	if (++cb->hops > 30)
-		goto drop;
-
-	skb->dev = rt->dst.dev;
-
-	/*
-	 * If packet goes out same interface it came in on, then set
-	 * the Intra-Ethernet bit. This has no effect for short
-	 * packets, so we don't need to test for them here.
-	 */
-	cb->rt_flags &= ~DN_RT_F_IE;
-	if (rt->rt_flags & RTCF_DOREDIRECT)
-		cb->rt_flags |= DN_RT_F_IE;
-
-	return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD,
-		       &init_net, NULL, skb, dev, skb->dev,
-		       dn_to_neigh_output);
-
-drop:
-	kfree_skb(skb);
-	return NET_RX_DROP;
-}
-
-/*
- * Used to catch bugs. This should never normally get
- * called.
- */
-static int dn_rt_bug_out(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
-	net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
-			    le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
-
-	kfree_skb(skb);
-
-	return NET_RX_DROP;
-}
-
-static int dn_rt_bug(struct sk_buff *skb)
-{
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
-	net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
-			    le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
-
-	kfree_skb(skb);
-
-	return NET_RX_DROP;
-}
-
-static unsigned int dn_dst_default_advmss(const struct dst_entry *dst)
-{
-	return dn_mss_from_pmtu(dst->dev, dst_mtu(dst));
-}
-
-static unsigned int dn_dst_mtu(const struct dst_entry *dst)
-{
-	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
-
-	return mtu ? : dst->dev->mtu;
-}
-
-static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
-					     struct sk_buff *skb,
-					     const void *daddr)
-{
-	return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);
-}
-
-static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
-{
-	struct dn_fib_info *fi = res->fi;
-	struct net_device *dev = rt->dst.dev;
-	unsigned int mss_metric;
-	struct neighbour *n;
-
-	if (fi) {
-		if (DN_FIB_RES_GW(*res) &&
-		    DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
-			rt->rt_gateway = DN_FIB_RES_GW(*res);
-		dst_init_metrics(&rt->dst, fi->fib_metrics, true);
-	}
-	rt->rt_type = res->type;
-
-	if (dev != NULL && rt->n == NULL) {
-		n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
-		if (IS_ERR(n))
-			return PTR_ERR(n);
-		rt->n = n;
-	}
-
-	if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
-		dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu);
-	mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS);
-	if (mss_metric) {
-		unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst));
-		if (mss_metric > mss)
-			dst_metric_set(&rt->dst, RTAX_ADVMSS, mss);
-	}
-	return 0;
-}
-
-static inline int dn_match_addr(__le16 addr1, __le16 addr2)
-{
-	__u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
-	int match = 16;
-	while(tmp) {
-		tmp >>= 1;
-		match--;
-	}
-	return match;
-}
-
-static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
-{
-	__le16 saddr = 0;
-	struct dn_dev *dn_db;
-	struct dn_ifaddr *ifa;
-	int best_match = 0;
-	int ret;
-
-	rcu_read_lock();
-	dn_db = rcu_dereference(dev->dn_ptr);
-	for (ifa = rcu_dereference(dn_db->ifa_list);
-	     ifa != NULL;
-	     ifa = rcu_dereference(ifa->ifa_next)) {
-		if (ifa->ifa_scope > scope)
-			continue;
-		if (!daddr) {
-			saddr = ifa->ifa_local;
-			break;
-		}
-		ret = dn_match_addr(daddr, ifa->ifa_local);
-		if (ret > best_match)
-			saddr = ifa->ifa_local;
-		if (best_match == 0)
-			saddr = ifa->ifa_local;
-	}
-	rcu_read_unlock();
-
-	return saddr;
-}
-
-static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
-{
-	return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
-}
-
-static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
-{
-	__le16 mask = dnet_make_mask(res->prefixlen);
-	return (daddr&~mask)|res->fi->fib_nh->nh_gw;
-}
-
-static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard)
-{
-	struct flowidn fld = {
-		.daddr = oldflp->daddr,
-		.saddr = oldflp->saddr,
-		.flowidn_scope = RT_SCOPE_UNIVERSE,
-		.flowidn_mark = oldflp->flowidn_mark,
-		.flowidn_iif = LOOPBACK_IFINDEX,
-		.flowidn_oif = oldflp->flowidn_oif,
-	};
-	struct dn_route *rt = NULL;
-	struct net_device *dev_out = NULL, *dev;
-	struct neighbour *neigh = NULL;
-	unsigned int hash;
-	unsigned int flags = 0;
-	struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
-	int err;
-	int free_res = 0;
-	__le16 gateway = 0;
-
-	if (decnet_debug_level & 16)
-		printk(KERN_DEBUG
-		       "dn_route_output_slow: dst=%04x src=%04x mark=%d"
-		       " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
-		       le16_to_cpu(oldflp->saddr),
-		       oldflp->flowidn_mark, LOOPBACK_IFINDEX,
-		       oldflp->flowidn_oif);
-
-	/* If we have an output interface, verify its a DECnet device */
-	if (oldflp->flowidn_oif) {
-		dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif);
-		err = -ENODEV;
-		if (dev_out && dev_out->dn_ptr == NULL) {
-			dev_put(dev_out);
-			dev_out = NULL;
-		}
-		if (dev_out == NULL)
-			goto out;
-	}
-
-	/* If we have a source address, verify that its a local address */
-	if (oldflp->saddr) {
-		err = -EADDRNOTAVAIL;
-
-		if (dev_out) {
-			if (dn_dev_islocal(dev_out, oldflp->saddr))
-				goto source_ok;
-			dev_put(dev_out);
-			goto out;
-		}
-		rcu_read_lock();
-		for_each_netdev_rcu(&init_net, dev) {
-			if (!dev->dn_ptr)
-				continue;
-			if (!dn_dev_islocal(dev, oldflp->saddr))
-				continue;
-			if ((dev->flags & IFF_LOOPBACK) &&
-			    oldflp->daddr &&
-			    !dn_dev_islocal(dev, oldflp->daddr))
-				continue;
-
-			dev_out = dev;
-			break;
-		}
-		rcu_read_unlock();
-		if (dev_out == NULL)
-			goto out;
-		dev_hold(dev_out);
-source_ok:
-		;
-	}
-
-	/* No destination? Assume its local */
-	if (!fld.daddr) {
-		fld.daddr = fld.saddr;
-
-		if (dev_out)
-			dev_put(dev_out);
-		err = -EINVAL;
-		dev_out = init_net.loopback_dev;
-		if (!dev_out->dn_ptr)
-			goto out;
-		err = -EADDRNOTAVAIL;
-		dev_hold(dev_out);
-		if (!fld.daddr) {
-			fld.daddr =
-			fld.saddr = dnet_select_source(dev_out, 0,
-						       RT_SCOPE_HOST);
-			if (!fld.daddr)
-				goto out;
-		}
-		fld.flowidn_oif = LOOPBACK_IFINDEX;
-		res.type = RTN_LOCAL;
-		goto make_route;
-	}
-
-	if (decnet_debug_level & 16)
-		printk(KERN_DEBUG
-		       "dn_route_output_slow: initial checks complete."
-		       " dst=%04x src=%04x oif=%d try_hard=%d\n",
-		       le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr),
-		       fld.flowidn_oif, try_hard);
-
-	/*
-	 * N.B. If the kernel is compiled without router support then
-	 * dn_fib_lookup() will evaluate to non-zero so this if () block
-	 * will always be executed.
-	 */
-	err = -ESRCH;
-	if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) {
-		struct dn_dev *dn_db;
-		if (err != -ESRCH)
-			goto out;
-		/*
-		 * Here the fallback is basically the standard algorithm for
-		 * routing in endnodes which is described in the DECnet routing
-		 * docs
-		 *
-		 * If we are not trying hard, look in neighbour cache.
-		 * The result is tested to ensure that if a specific output
-		 * device/source address was requested, then we honour that
-		 * here
-		 */
-		if (!try_hard) {
-			neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr);
-			if (neigh) {
-				if ((oldflp->flowidn_oif &&
-				    (neigh->dev->ifindex != oldflp->flowidn_oif)) ||
-				    (oldflp->saddr &&
-				    (!dn_dev_islocal(neigh->dev,
-						     oldflp->saddr)))) {
-					neigh_release(neigh);
-					neigh = NULL;
-				} else {
-					if (dev_out)
-						dev_put(dev_out);
-					if (dn_dev_islocal(neigh->dev, fld.daddr)) {
-						dev_out = init_net.loopback_dev;
-						res.type = RTN_LOCAL;
-					} else {
-						dev_out = neigh->dev;
-					}
-					dev_hold(dev_out);
-					goto select_source;
-				}
-			}
-		}
-
-		/* Not there? Perhaps its a local address */
-		if (dev_out == NULL)
-			dev_out = dn_dev_get_default();
-		err = -ENODEV;
-		if (dev_out == NULL)
-			goto out;
-		dn_db = rcu_dereference_raw(dev_out->dn_ptr);
-		if (!dn_db)
-			goto e_inval;
-		/* Possible improvement - check all devices for local addr */
-		if (dn_dev_islocal(dev_out, fld.daddr)) {
-			dev_put(dev_out);
-			dev_out = init_net.loopback_dev;
-			dev_hold(dev_out);
-			res.type = RTN_LOCAL;
-			goto select_source;
-		}
-		/* Not local either.... try sending it to the default router */
-		neigh = neigh_clone(dn_db->router);
-		BUG_ON(neigh && neigh->dev != dev_out);
-
-		/* Ok then, we assume its directly connected and move on */
-select_source:
-		if (neigh)
-			gateway = ((struct dn_neigh *)neigh)->addr;
-		if (gateway == 0)
-			gateway = fld.daddr;
-		if (fld.saddr == 0) {
-			fld.saddr = dnet_select_source(dev_out, gateway,
-						       res.type == RTN_LOCAL ?
-						       RT_SCOPE_HOST :
-						       RT_SCOPE_LINK);
-			if (fld.saddr == 0 && res.type != RTN_LOCAL)
-				goto e_addr;
-		}
-		fld.flowidn_oif = dev_out->ifindex;
-		goto make_route;
-	}
-	free_res = 1;
-
-	if (res.type == RTN_NAT)
-		goto e_inval;
-
-	if (res.type == RTN_LOCAL) {
-		if (!fld.saddr)
-			fld.saddr = fld.daddr;
-		if (dev_out)
-			dev_put(dev_out);
-		dev_out = init_net.loopback_dev;
-		dev_hold(dev_out);
-		if (!dev_out->dn_ptr)
-			goto e_inval;
-		fld.flowidn_oif = dev_out->ifindex;
-		if (res.fi)
-			dn_fib_info_put(res.fi);
-		res.fi = NULL;
-		goto make_route;
-	}
-
-	if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
-		dn_fib_select_multipath(&fld, &res);
-
-	/*
-	 * We could add some logic to deal with default routes here and
-	 * get rid of some of the special casing above.
-	 */
-
-	if (!fld.saddr)
-		fld.saddr = DN_FIB_RES_PREFSRC(res);
-
-	if (dev_out)
-		dev_put(dev_out);
-	dev_out = DN_FIB_RES_DEV(res);
-	dev_hold(dev_out);
-	fld.flowidn_oif = dev_out->ifindex;
-	gateway = DN_FIB_RES_GW(res);
-
-make_route:
-	if (dev_out->flags & IFF_LOOPBACK)
-		flags |= RTCF_LOCAL;
-
-	rt = dst_alloc(&dn_dst_ops, dev_out, 0, DST_OBSOLETE_NONE, DST_HOST);
-	if (rt == NULL)
-		goto e_nobufs;
-
-	rt->dn_next = NULL;
-	memset(&rt->fld, 0, sizeof(rt->fld));
-	rt->fld.saddr        = oldflp->saddr;
-	rt->fld.daddr        = oldflp->daddr;
-	rt->fld.flowidn_oif  = oldflp->flowidn_oif;
-	rt->fld.flowidn_iif  = 0;
-	rt->fld.flowidn_mark = oldflp->flowidn_mark;
-
-	rt->rt_saddr      = fld.saddr;
-	rt->rt_daddr      = fld.daddr;
-	rt->rt_gateway    = gateway ? gateway : fld.daddr;
-	rt->rt_local_src  = fld.saddr;
-
-	rt->rt_dst_map    = fld.daddr;
-	rt->rt_src_map    = fld.saddr;
-
-	rt->n = neigh;
-	neigh = NULL;
-
-	rt->dst.lastuse = jiffies;
-	rt->dst.output  = dn_output;
-	rt->dst.input   = dn_rt_bug;
-	rt->rt_flags      = flags;
-	if (flags & RTCF_LOCAL)
-		rt->dst.input = dn_nsp_rx;
-
-	err = dn_rt_set_next_hop(rt, &res);
-	if (err)
-		goto e_neighbour;
-
-	hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
-	/* dn_insert_route() increments dst->__refcnt */
-	dn_insert_route(rt, hash, (struct dn_route **)pprt);
-
-done:
-	if (neigh)
-		neigh_release(neigh);
-	if (free_res)
-		dn_fib_res_put(&res);
-	if (dev_out)
-		dev_put(dev_out);
-out:
-	return err;
-
-e_addr:
-	err = -EADDRNOTAVAIL;
-	goto done;
-e_inval:
-	err = -EINVAL;
-	goto done;
-e_nobufs:
-	err = -ENOBUFS;
-	goto done;
-e_neighbour:
-	dst_release_immediate(&rt->dst);
-	goto e_nobufs;
-}
-
-
-/*
- * N.B. The flags may be moved into the flowi at some future stage.
- */
-static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags)
-{
-	unsigned int hash = dn_hash(flp->saddr, flp->daddr);
-	struct dn_route *rt = NULL;
-
-	if (!(flags & MSG_TRYHARD)) {
-		rcu_read_lock_bh();
-		for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
-			rt = rcu_dereference_bh(rt->dn_next)) {
-			if ((flp->daddr == rt->fld.daddr) &&
-			    (flp->saddr == rt->fld.saddr) &&
-			    (flp->flowidn_mark == rt->fld.flowidn_mark) &&
-			    dn_is_output_route(rt) &&
-			    (rt->fld.flowidn_oif == flp->flowidn_oif)) {
-				dst_hold_and_use(&rt->dst, jiffies);
-				rcu_read_unlock_bh();
-				*pprt = &rt->dst;
-				return 0;
-			}
-		}
-		rcu_read_unlock_bh();
-	}
-
-	return dn_route_output_slow(pprt, flp, flags);
-}
-
-static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags)
-{
-	int err;
-
-	err = __dn_route_output_key(pprt, flp, flags);
-	if (err == 0 && flp->flowidn_proto) {
-		*pprt = xfrm_lookup(&init_net, *pprt,
-				    flowidn_to_flowi(flp), NULL, 0);
-		if (IS_ERR(*pprt)) {
-			err = PTR_ERR(*pprt);
-			*pprt = NULL;
-		}
-	}
-	return err;
-}
-
-int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *fl, struct sock *sk, int flags)
-{
-	int err;
-
-	err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
-	if (err == 0 && fl->flowidn_proto) {
-		*pprt = xfrm_lookup(&init_net, *pprt,
-				    flowidn_to_flowi(fl), sk, 0);
-		if (IS_ERR(*pprt)) {
-			err = PTR_ERR(*pprt);
-			*pprt = NULL;
-		}
-	}
-	return err;
-}
-
-static int dn_route_input_slow(struct sk_buff *skb)
-{
-	struct dn_route *rt = NULL;
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-	struct net_device *in_dev = skb->dev;
-	struct net_device *out_dev = NULL;
-	struct dn_dev *dn_db;
-	struct neighbour *neigh = NULL;
-	unsigned int hash;
-	int flags = 0;
-	__le16 gateway = 0;
-	__le16 local_src = 0;
-	struct flowidn fld = {
-		.daddr = cb->dst,
-		.saddr = cb->src,
-		.flowidn_scope = RT_SCOPE_UNIVERSE,
-		.flowidn_mark = skb->mark,
-		.flowidn_iif = skb->dev->ifindex,
-	};
-	struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
-	int err = -EINVAL;
-	int free_res = 0;
-
-	dev_hold(in_dev);
-
-	if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
-		goto out;
-
-	/* Zero source addresses are not allowed */
-	if (fld.saddr == 0)
-		goto out;
-
-	/*
-	 * In this case we've just received a packet from a source
-	 * outside ourselves pretending to come from us. We don't
-	 * allow it any further to prevent routing loops, spoofing and
-	 * other nasties. Loopback packets already have the dst attached
-	 * so this only affects packets which have originated elsewhere.
-	 */
-	err  = -ENOTUNIQ;
-	if (dn_dev_islocal(in_dev, cb->src))
-		goto out;
-
-	err = dn_fib_lookup(&fld, &res);
-	if (err) {
-		if (err != -ESRCH)
-			goto out;
-		/*
-		 * Is the destination us ?
-		 */
-		if (!dn_dev_islocal(in_dev, cb->dst))
-			goto e_inval;
-
-		res.type = RTN_LOCAL;
-	} else {
-		__le16 src_map = fld.saddr;
-		free_res = 1;
-
-		out_dev = DN_FIB_RES_DEV(res);
-		if (out_dev == NULL) {
-			net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n");
-			goto e_inval;
-		}
-		dev_hold(out_dev);
-
-		if (res.r)
-			src_map = fld.saddr; /* no NAT support for now */
-
-		gateway = DN_FIB_RES_GW(res);
-		if (res.type == RTN_NAT) {
-			fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res);
-			dn_fib_res_put(&res);
-			free_res = 0;
-			if (dn_fib_lookup(&fld, &res))
-				goto e_inval;
-			free_res = 1;
-			if (res.type != RTN_UNICAST)
-				goto e_inval;
-			flags |= RTCF_DNAT;
-			gateway = fld.daddr;
-		}
-		fld.saddr = src_map;
-	}
-
-	switch(res.type) {
-	case RTN_UNICAST:
-		/*
-		 * Forwarding check here, we only check for forwarding
-		 * being turned off, if you want to only forward intra
-		 * area, its up to you to set the routing tables up
-		 * correctly.
-		 */
-		if (dn_db->parms.forwarding == 0)
-			goto e_inval;
-
-		if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
-			dn_fib_select_multipath(&fld, &res);
-
-		/*
-		 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
-		 * flag as a hint to set the intra-ethernet bit when
-		 * forwarding. If we've got NAT in operation, we don't do
-		 * this optimisation.
-		 */
-		if (out_dev == in_dev && !(flags & RTCF_NAT))
-			flags |= RTCF_DOREDIRECT;
-
-		local_src = DN_FIB_RES_PREFSRC(res);
-
-	case RTN_BLACKHOLE:
-	case RTN_UNREACHABLE:
-		break;
-	case RTN_LOCAL:
-		flags |= RTCF_LOCAL;
-		fld.saddr = cb->dst;
-		fld.daddr = cb->src;
-
-		/* Routing tables gave us a gateway */
-		if (gateway)
-			goto make_route;
-
-		/* Packet was intra-ethernet, so we know its on-link */
-		if (cb->rt_flags & DN_RT_F_IE) {
-			gateway = cb->src;
-			goto make_route;
-		}
-
-		/* Use the default router if there is one */
-		neigh = neigh_clone(dn_db->router);
-		if (neigh) {
-			gateway = ((struct dn_neigh *)neigh)->addr;
-			goto make_route;
-		}
-
-		/* Close eyes and pray */
-		gateway = cb->src;
-		goto make_route;
-	default:
-		goto e_inval;
-	}
-
-make_route:
-	rt = dst_alloc(&dn_dst_ops, out_dev, 1, DST_OBSOLETE_NONE, DST_HOST);
-	if (rt == NULL)
-		goto e_nobufs;
-
-	rt->dn_next = NULL;
-	memset(&rt->fld, 0, sizeof(rt->fld));
-	rt->rt_saddr      = fld.saddr;
-	rt->rt_daddr      = fld.daddr;
-	rt->rt_gateway    = fld.daddr;
-	if (gateway)
-		rt->rt_gateway = gateway;
-	rt->rt_local_src  = local_src ? local_src : rt->rt_saddr;
-
-	rt->rt_dst_map    = fld.daddr;
-	rt->rt_src_map    = fld.saddr;
-
-	rt->fld.saddr        = cb->src;
-	rt->fld.daddr        = cb->dst;
-	rt->fld.flowidn_oif  = 0;
-	rt->fld.flowidn_iif  = in_dev->ifindex;
-	rt->fld.flowidn_mark = fld.flowidn_mark;
-
-	rt->n = neigh;
-	rt->dst.lastuse = jiffies;
-	rt->dst.output = dn_rt_bug_out;
-	switch (res.type) {
-	case RTN_UNICAST:
-		rt->dst.input = dn_forward;
-		break;
-	case RTN_LOCAL:
-		rt->dst.output = dn_output;
-		rt->dst.input = dn_nsp_rx;
-		rt->dst.dev = in_dev;
-		flags |= RTCF_LOCAL;
-		break;
-	default:
-	case RTN_UNREACHABLE:
-	case RTN_BLACKHOLE:
-		rt->dst.input = dst_discard;
-	}
-	rt->rt_flags = flags;
-
-	err = dn_rt_set_next_hop(rt, &res);
-	if (err)
-		goto e_neighbour;
-
-	hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
-	/* dn_insert_route() increments dst->__refcnt */
-	dn_insert_route(rt, hash, &rt);
-	skb_dst_set(skb, &rt->dst);
-
-done:
-	if (neigh)
-		neigh_release(neigh);
-	if (free_res)
-		dn_fib_res_put(&res);
-	dev_put(in_dev);
-	if (out_dev)
-		dev_put(out_dev);
-out:
-	return err;
-
-e_inval:
-	err = -EINVAL;
-	goto done;
-
-e_nobufs:
-	err = -ENOBUFS;
-	goto done;
-
-e_neighbour:
-	dst_release_immediate(&rt->dst);
-	goto done;
-}
-
-static int dn_route_input(struct sk_buff *skb)
-{
-	struct dn_route *rt;
-	struct dn_skb_cb *cb = DN_SKB_CB(skb);
-	unsigned int hash = dn_hash(cb->src, cb->dst);
-
-	if (skb_dst(skb))
-		return 0;
-
-	rcu_read_lock();
-	for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
-	    rt = rcu_dereference(rt->dn_next)) {
-		if ((rt->fld.saddr == cb->src) &&
-		    (rt->fld.daddr == cb->dst) &&
-		    (rt->fld.flowidn_oif == 0) &&
-		    (rt->fld.flowidn_mark == skb->mark) &&
-		    (rt->fld.flowidn_iif == cb->iif)) {
-			dst_hold_and_use(&rt->dst, jiffies);
-			rcu_read_unlock();
-			skb_dst_set(skb, (struct dst_entry *)rt);
-			return 0;
-		}
-	}
-	rcu_read_unlock();
-
-	return dn_route_input_slow(skb);
-}
-
-static int dn_rt_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
-			   int event, int nowait, unsigned int flags)
-{
-	struct dn_route *rt = (struct dn_route *)skb_dst(skb);
-	struct rtmsg *r;
-	struct nlmsghdr *nlh;
-	long expires;
-
-	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags);
-	if (!nlh)
-		return -EMSGSIZE;
-
-	r = nlmsg_data(nlh);
-	r->rtm_family = AF_DECnet;
-	r->rtm_dst_len = 16;
-	r->rtm_src_len = 0;
-	r->rtm_tos = 0;
-	r->rtm_table = RT_TABLE_MAIN;
-	r->rtm_type = rt->rt_type;
-	r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
-	r->rtm_scope = RT_SCOPE_UNIVERSE;
-	r->rtm_protocol = RTPROT_UNSPEC;
-
-	if (rt->rt_flags & RTCF_NOTIFY)
-		r->rtm_flags |= RTM_F_NOTIFY;
-
-	if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 ||
-	    nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0)
-		goto errout;
-
-	if (rt->fld.saddr) {
-		r->rtm_src_len = 16;
-		if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0)
-			goto errout;
-	}
-	if (rt->dst.dev &&
-	    nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0)
-		goto errout;
-
-	/*
-	 * Note to self - change this if input routes reverse direction when
-	 * they deal only with inputs and not with replies like they do
-	 * currently.
-	 */
-	if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0)
-		goto errout;
-
-	if (rt->rt_daddr != rt->rt_gateway &&
-	    nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0)
-		goto errout;
-
-	if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
-		goto errout;
-
-	expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
-	if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires,
-			       rt->dst.error) < 0)
-		goto errout;
-
-	if (dn_is_input_route(rt) &&
-	    nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0)
-		goto errout;
-
-	nlmsg_end(skb, nlh);
-	return 0;
-
-errout:
-	nlmsg_cancel(skb, nlh);
-	return -EMSGSIZE;
-}
-
-const struct nla_policy rtm_dn_policy[RTA_MAX + 1] = {
-	[RTA_DST]		= { .type = NLA_U16 },
-	[RTA_SRC]		= { .type = NLA_U16 },
-	[RTA_IIF]		= { .type = NLA_U32 },
-	[RTA_OIF]		= { .type = NLA_U32 },
-	[RTA_GATEWAY]		= { .type = NLA_U16 },
-	[RTA_PRIORITY]		= { .type = NLA_U32 },
-	[RTA_PREFSRC]		= { .type = NLA_U16 },
-	[RTA_METRICS]		= { .type = NLA_NESTED },
-	[RTA_MULTIPATH]		= { .type = NLA_NESTED },
-	[RTA_TABLE]		= { .type = NLA_U32 },
-	[RTA_MARK]		= { .type = NLA_U32 },
-};
-
-/*
- * This is called by both endnodes and routers now.
- */
-static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
-			     struct netlink_ext_ack *extack)
-{
-	struct net *net = sock_net(in_skb->sk);
-	struct rtmsg *rtm = nlmsg_data(nlh);
-	struct dn_route *rt = NULL;
-	struct dn_skb_cb *cb;
-	int err;
-	struct sk_buff *skb;
-	struct flowidn fld;
-	struct nlattr *tb[RTA_MAX+1];
-
-	if (!net_eq(net, &init_net))
-		return -EINVAL;
-
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_dn_policy,
-			  extack);
-	if (err < 0)
-		return err;
-
-	memset(&fld, 0, sizeof(fld));
-	fld.flowidn_proto = DNPROTO_NSP;
-
-	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-	if (skb == NULL)
-		return -ENOBUFS;
-	skb_reset_mac_header(skb);
-	cb = DN_SKB_CB(skb);
-
-	if (tb[RTA_SRC])
-		fld.saddr = nla_get_le16(tb[RTA_SRC]);
-
-	if (tb[RTA_DST])
-		fld.daddr = nla_get_le16(tb[RTA_DST]);
-
-	if (tb[RTA_IIF])
-		fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]);
-
-	if (fld.flowidn_iif) {
-		struct net_device *dev;
-		dev = __dev_get_by_index(&init_net, fld.flowidn_iif);
-		if (!dev || !dev->dn_ptr) {
-			kfree_skb(skb);
-			return -ENODEV;
-		}
-		skb->protocol = htons(ETH_P_DNA_RT);
-		skb->dev = dev;
-		cb->src = fld.saddr;
-		cb->dst = fld.daddr;
-		local_bh_disable();
-		err = dn_route_input(skb);
-		local_bh_enable();
-		memset(cb, 0, sizeof(struct dn_skb_cb));
-		rt = (struct dn_route *)skb_dst(skb);
-		if (!err && -rt->dst.error)
-			err = rt->dst.error;
-	} else {
-		if (tb[RTA_OIF])
-			fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]);
-
-		err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
-	}
-
-	skb->dev = NULL;
-	if (err)
-		goto out_free;
-	skb_dst_set(skb, &rt->dst);
-	if (rtm->rtm_flags & RTM_F_NOTIFY)
-		rt->rt_flags |= RTCF_NOTIFY;
-
-	err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
-	if (err < 0) {
-		err = -EMSGSIZE;
-		goto out_free;
-	}
-
-	return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid);
-
-out_free:
-	kfree_skb(skb);
-	return err;
-}
-
-/*
- * For routers, this is called from dn_fib_dump, but for endnodes its
- * called directly from the rtnetlink dispatch table.
- */
-int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
-{
-	struct net *net = sock_net(skb->sk);
-	struct dn_route *rt;
-	int h, s_h;
-	int idx, s_idx;
-	struct rtmsg *rtm;
-
-	if (!net_eq(net, &init_net))
-		return 0;
-
-	if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg))
-		return -EINVAL;
-
-	rtm = nlmsg_data(cb->nlh);
-	if (!(rtm->rtm_flags & RTM_F_CLONED))
-		return 0;
-
-	s_h = cb->args[0];
-	s_idx = idx = cb->args[1];
-	for(h = 0; h <= dn_rt_hash_mask; h++) {
-		if (h < s_h)
-			continue;
-		if (h > s_h)
-			s_idx = 0;
-		rcu_read_lock_bh();
-		for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
-			rt;
-			rt = rcu_dereference_bh(rt->dn_next), idx++) {
-			if (idx < s_idx)
-				continue;
-			skb_dst_set(skb, dst_clone(&rt->dst));
-			if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid,
-					cb->nlh->nlmsg_seq, RTM_NEWROUTE,
-					1, NLM_F_MULTI) < 0) {
-				skb_dst_drop(skb);
-				rcu_read_unlock_bh();
-				goto done;
-			}
-			skb_dst_drop(skb);
-		}
-		rcu_read_unlock_bh();
-	}
-
-done:
-	cb->args[0] = h;
-	cb->args[1] = idx;
-	return skb->len;
-}
-
-#ifdef CONFIG_PROC_FS
-struct dn_rt_cache_iter_state {
-	int bucket;
-};
-
-static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
-{
-	struct dn_route *rt = NULL;
-	struct dn_rt_cache_iter_state *s = seq->private;
-
-	for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
-		rcu_read_lock_bh();
-		rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
-		if (rt)
-			break;
-		rcu_read_unlock_bh();
-	}
-	return rt;
-}
-
-static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
-{
-	struct dn_rt_cache_iter_state *s = seq->private;
-
-	rt = rcu_dereference_bh(rt->dn_next);
-	while (!rt) {
-		rcu_read_unlock_bh();
-		if (--s->bucket < 0)
-			break;
-		rcu_read_lock_bh();
-		rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
-	}
-	return rt;
-}
-
-static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
-{
-	struct dn_route *rt = dn_rt_cache_get_first(seq);
-
-	if (rt) {
-		while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
-			--*pos;
-	}
-	return *pos ? NULL : rt;
-}
-
-static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
-	struct dn_route *rt = dn_rt_cache_get_next(seq, v);
-	++*pos;
-	return rt;
-}
-
-static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
-{
-	if (v)
-		rcu_read_unlock_bh();
-}
-
-static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
-{
-	struct dn_route *rt = v;
-	char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
-
-	seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
-		   rt->dst.dev ? rt->dst.dev->name : "*",
-		   dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
-		   dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
-		   atomic_read(&rt->dst.__refcnt),
-		   rt->dst.__use, 0);
-	return 0;
-}
-
-static const struct seq_operations dn_rt_cache_seq_ops = {
-	.start	= dn_rt_cache_seq_start,
-	.next	= dn_rt_cache_seq_next,
-	.stop	= dn_rt_cache_seq_stop,
-	.show	= dn_rt_cache_seq_show,
-};
-#endif /* CONFIG_PROC_FS */
-
-void __init dn_route_init(void)
-{
-	int i, goal, order;
-
-	dn_dst_ops.kmem_cachep =
-		kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
-				  SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
-	dst_entries_init(&dn_dst_ops);
-	timer_setup(&dn_route_timer, dn_dst_check_expire, 0);
-	dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
-	add_timer(&dn_route_timer);
-
-	goal = totalram_pages >> (26 - PAGE_SHIFT);
-
-	for(order = 0; (1UL << order) < goal; order++)
-		/* NOTHING */;
-
-	/*
-	 * Only want 1024 entries max, since the table is very, very unlikely
-	 * to be larger than that.
-	 */
-	while(order && ((((1UL << order) * PAGE_SIZE) /
-				sizeof(struct dn_rt_hash_bucket)) >= 2048))
-		order--;
-
-	do {
-		dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
-			sizeof(struct dn_rt_hash_bucket);
-		while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
-			dn_rt_hash_mask--;
-		dn_rt_hash_table = (struct dn_rt_hash_bucket *)
-			__get_free_pages(GFP_ATOMIC, order);
-	} while (dn_rt_hash_table == NULL && --order > 0);
-
-	if (!dn_rt_hash_table)
-		panic("Failed to allocate DECnet route cache hash table\n");
-
-	printk(KERN_INFO
-		"DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
-		dn_rt_hash_mask,
-		(long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
-
-	dn_rt_hash_mask--;
-	for(i = 0; i <= dn_rt_hash_mask; i++) {
-		spin_lock_init(&dn_rt_hash_table[i].lock);
-		dn_rt_hash_table[i].chain = NULL;
-	}
-
-	dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
-
-	proc_create_seq_private("decnet_cache", 0444, init_net.proc_net,
-			&dn_rt_cache_seq_ops,
-			sizeof(struct dn_rt_cache_iter_state), NULL);
-
-#ifdef CONFIG_DECNET_ROUTER
-	rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
-			     dn_cache_getroute, dn_fib_dump, 0);
-#else
-	rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
-			     dn_cache_getroute, dn_cache_dump, 0);
-#endif
-}
-
-void __exit dn_route_cleanup(void)
-{
-	del_timer(&dn_route_timer);
-	dn_run_flush(NULL);
-
-	remove_proc_entry("decnet_cache", init_net.proc_net);
-	dst_entries_destroy(&dn_dst_ops);
-}